package it.spasia.opencmis.criteria.restrictions;

/*
 * Copyright 2010 Marco Spasiano (marco.spasiano@gmail.com)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * $Id: PropertyExpression.java 1 2010-12-09 11:44:57Z marco.spasiano $
 */

import it.spasia.opencmis.criteria.Criterion;
import it.spasia.opencmis.criteria.CMISContext;

/**
 * Represents expression comparing two properties.
 *
 * @author <a href="mailto:marco.spasiano@gmail.com">Marco Spasiano</a>
 * @version $Revision: 1 $
 */
public class PropertyExpression
    implements Criterion
{
    private static final long serialVersionUID = 1L;

    private final String propertyName;

    private final String otherPropertyName;

    private final String operator;

    public PropertyExpression( String propertyName, String otherPropertyName,
                               SimpleExpressionOperator operator )
    {
        this( propertyName, otherPropertyName,
              ( operator != null ) ? operator.getStringRepresentation()
                              : "null" );
    }

    public PropertyExpression( String propertyName, String otherPropertyName,
                               String operator )
    {
        this.propertyName = propertyName;
        this.otherPropertyName = otherPropertyName;
        this.operator = operator;
    }

    public String toQueryFragment( CMISContext CMISContext )
    {
        final String qualifiedPropertyName =CMISContext.prefix( this.propertyName );
        final String qualifiedOtherPropertyName = CMISContext.prefix( this.otherPropertyName );

        StringBuilder buffer = new StringBuilder();
        buffer.append( qualifiedPropertyName );
        buffer.append( " " );
        buffer.append( this.operator );
        buffer.append( " " );
        buffer.append( qualifiedOtherPropertyName );

        return buffer.toString();
    }

}
